Dayton Audio MB820-8

• Sensitivity (1W, 1m, infinite baffle) SPL1W 92.6dB
• Frequency response 100 - 7500Hz

Thiele & Small parameters

• Resonance frequency (free air) fS 69Hz
• Mechanical quality factor QMS 3.83
• Electrical quality factor QES 0.52
• Total quality factor QTS 0.46

Large signal parameters

• Maximum linear excursion xmax 4mm
• Air volume displaced at xmax VD 98cm³
• Power handling P 200W
• Program power Pmax 400W

Voice Coil

• Nominal impedance Z 8Ω
• DC resistance RE 5.3Ω
• Inductance (1kHz) LE 1.04mH
• VC Diameter 50.8mm
• Winding material CCA

Magnet

• Force factor Bl 9.6N/A
• Motor constant Bl/√RE 4.19N/√W
• Weight 1.077kg
• Material Ferrite

Diaphragm

• Effective diameter 176mm
• Effective area SD 244cm²
• Moving mass MMS 20.9g
• Moving mass (without air load) MMD 18.2g
• Material Paper

Suspensions

• Stiffness KMS 3.97N/mm
• Compliance CMS 252µm/N
• Equivalent volume to the compliance VAS 15.8L
• Mechanical resistance RMS 2.37N·s/m
• Surround material Cloth

Dimensions

• Nominal diameter 8″
• 209mm
• Overall diameter 209mm
• Baffle cutout diameter 181mm
• Overall depth 91mm
• Volume occupied by the driver (estimated) 0.77L
• Frame material Steel